Digital Pre-Distortion Calibration via Antenna Standing Wave Detection
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Solution Overview
Problem
Current digital pre-distortion (DPD) calibration methods suffer from low accuracy when an antenna is close to a face or held by a user, leading to increased radio frequency power consumption and performance deterioration.
Innovation Solution
A method that detects the standing wave status of an antenna and adjusts the DPD calibration accordingly, enabling or disabling the DPD function based on preset conditions to maintain optimal performance and accuracy, using a coupler to correct DPD coefficients and perform calibration only when the antenna is in a suitable state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DPD calibration is performed continuously to maintain linearity, then PA linearity is improved, but radio frequency power consumption increases
Solution Approach 1:
The patent implements periodic DPD calibration based on standing wave status detection. Instead of continuous calibration, the system periodically calibrates only when the antenna is in a suitable state (normal standing wave status), thereby maintaining PA linearity while reducing unnecessary power consumption during unsuitable calibration conditions.
2Productivity
If DPD calibration is performed when antenna is close to face or held by user, then calibration is executed, but calibration accuracy deteriorates due to distorted sampled signals
Solution Approach 1:
The patent dynamically adjusts the DPD calibration process based on real-time detection of standing wave status. When the antenna is close to a face or held by a user (detected through abnormal standing wave status), the system automatically suspends calibration to avoid inaccurate results. This dynamic adaptation ensures calibration is only performed under optimal conditions, maintaining both productivity and measurement precision.
3Reliability
If DPD function is always enabled to maintain performance, then linearity is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic control of the DPD function through standing wave status detection. The system automatically enables or disables DPD calibration based on whether the antenna is in a suitable state, rather than continuously enabling it. This dynamic approach maintains signal linearity when needed while reducing system complexity and resource usage when calibration conditions are not met.
Data Source
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AI summary
Disclosed in embodiments of the present invention are a digital pre-distortion processing method and an electronic device, for use in solving the problem of low DPD calibration precision. The method is applied to the electronic device and comprises: detecting a standing wave state of an antenna of the electronic device; under a condition that the standing wave state meets a preset working condition, obtaining a calibration result by means of digital pre-distortion calibration; and determining whether to enable a digital pre-distortion function or not according to the calibration result.